Re: [PATCH] kvm: remove invalid check for debugfs_create_dir()

[Sean Christopherson <sean.j.christopherson@intel.com>]

On Wed, Jun 12, 2019 at 04:50:33PM +0200, Greg Kroah-Hartman wrote:
> debugfs_create_dir() can never return NULL, so no need to check for an
> impossible thing.
> 
> It's also not needed to ever check the return value of this function, so
> just remove the check entirely, and indent the previous line to a sane
> formatting :)
> 
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: "Radim Krčmář" <rkrcmar@redhat.com>
> Cc: kvm@vger.kernel.org
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  virt/kvm/kvm_main.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index ca54b09adf5b..4b4ef642d8fa 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -2605,9 +2605,7 @@ static int kvm_create_vcpu_debugfs(struct kvm_vcpu *vcpu)
>  
>  	snprintf(dir_name, sizeof(dir_name), "vcpu%d", vcpu->vcpu_id);
>  	vcpu->debugfs_dentry = debugfs_create_dir(dir_name,
> -								vcpu->kvm->debugfs_dentry);
> -	if (!vcpu->debugfs_dentry)
> -		return -ENOMEM;
> +						  vcpu->kvm->debugfs_dentry);
>  
>  	ret = kvm_arch_create_vcpu_debugfs(vcpu);
>  	if (ret < 0) {
> -- 
> 2.22.0

Any objection to me pulling this into a series to clean up similar issues
in arch/x86/kvm/debugfs.c -> kvm_arch_create_vcpu_debugfs(), and to
change kvm_create_vcpu_debugfs() to not return success/failure?  It'd be
nice to fix everything in a single shot.